CVE-2021-47649
udmabuf: validate ubuf->pagecount
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Feb 26, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
fbb0de795078190a9834b3409e4b009cfb18a6d4 < 5d50f851dd307c07ca5591297093f19967c834a9 fbb0de795078190a9834b3409e4b009cfb18a6d4 < b267a8118c2b171bf7d67b90ed64154eeab9fae0 fbb0de795078190a9834b3409e4b009cfb18a6d4 < 811b667cefbea9cb7511a874b169d6a92907137e fbb0de795078190a9834b3409e4b009cfb18a6d4 < a3728d32fc61eb0fe283cb8ff60b2c8f751e2202 fbb0de795078190a9834b3409e4b009cfb18a6d4 < 9e9b4a269f84d3230f2af84ff42322db676440d9 fbb0de795078190a9834b3409e4b009cfb18a6d4 < 2b6dd600dd72573c23ea180b5b0b2f1813405882
Linux / Linux
4.20
References
git.kernel.org: https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9 git.kernel.org: https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0 git.kernel.org: https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e git.kernel.org: https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202 git.kernel.org: https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9 git.kernel.org: https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882